Evaluate
\left(m-4\right)\left(m+8\right)
Expand
m^{2}+4m-32
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m^{2}+4m+4-36
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(m+2\right)^{2}.
m^{2}+4m-32
Subtract 36 from 4 to get -32.
m^{2}+4m+4-36
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(m+2\right)^{2}.
m^{2}+4m-32
Subtract 36 from 4 to get -32.
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